Steam-boiler.



J. P. NEFF.

STEAM BOILER.

APPLICATION FILED MAY 12, I913.

1,138,057. Patented May 4, 1915.

TED STATES PATENT FFICE.

JOHN P. NEFF, OF EAST ORANGE, NEW JERSEY, ASSIGNOR, BY MESNE ASSIGNMENTS,

T0 AMERICAN ARCH COMPANY, OF NEW YORK, N. Y., A COEPQRATION OF DELA- WARE.

STEAM BOILER.

Specification of Letters Patent.

Patented May 4, 1915.

Application filed May 12, 1913. Serial No. 767,055.

To all whom it may concern Be it known that I, JOHN P. Nnrr, a citizenof theUnited States, and a resident of East Orange, county of Essex and State of New Jersey, have invented certain new and useful Improvements in Steam-Boilers, of which the following is aspecification.

My invention relates to improvements in locomotive boilers and has particular reference to improvements in locomotive fire boxes of the extended combustion chamber t pe.

The object of my invention is to increase the efiiciency of locomotive fire boxes of the extended fire box type; to increase the interior radiating surface through which the heat of combustion may be transmitted to the water of the boiler; to increase the circulation of water in the boiler; and to increase the admixture and commingling of the gases of combustion as they flow from the fuel bed to the fines.

My invention consists in a locomotive fire box which has a barrel-like extension at its forward end and which is provided with a number of water-circulating tubes which rise from the lower portion of the extension and extend rearwardly and upwardly to the rear sheet of the fire box.

My invention further'consists in a fire box of the extension type, provided with a refractory bafile arranged between the grate and the flue sheet and dividing the fire box into a main and an auxiliary combustion chamber, the baffle comprising a wall arranged within the extension of the fire box in combination with an inclinedrefractory arch supported in position by water circu lating tubes which extend from the lower part of the extension upwardly and rearwardly through the fire box to the rear end thereof, said'arch having itsforward end arranged against the upper part of the transverse wall.

My invention furtherconsists in a locomotive boiler fire box of the extension type in combination with a transverse vertical refractory wall arranged within the rear end of the fire box extension, a transversely extending longitudinally inclined arch or baille in the fire box, with its forward end arranged againstthe upper part of the wall and inclined water circulating tubes extending fromthe lower part of the'extension upwardly and rearwardly throu h the fire box and upon which the incline arch is supported, the arch 'bein composed of wedge shaped bricks arranged on and between the tubes.

My invention further consists in the various features of construction and the combination and arrangen'ients of parts, where by the above and other objects are attained, and all as hereinafter described and particularly pointed out in the appended claims.

My inv'ention will be more readily understood by reference to the accompanying drawings in which:

Figure 1 is a central longitudinal sectional view of a locomotive boiler fire box having an extension at its forward end and provided in accordance with my invention with a plurality of water-circulating tubes; Fig. 2 is a vertical transverse sectional View of the fire box on the line 2-2 of. Fig. 1; Fig. 3 is a view similar to Fig. 1, but showing a modified form of tube; and Fig. 4 is a transverse section of the arch. on the line 44 of Fig. 3.

In order to obtain sufficient fire box space without making the fire box too wide, some locomotive fire boxes are extended forwardly within the barrel of the boiler, the flue sheet in such instances being set forward in the boilerbeyond the forward end of the grates. This construction provides a water space between the extended end or combustion chamber of the fire box and the lower outside sheet of the boiler and I connect this water box proper A, above the grate B, and an extension combustion space C within the bar} rel portion D of the boiler. The two combustion spaces A and C complete the fire box 4 space and this space is inclosed by the fiu sheet E at the forward end, the rear sheet F at the rear end, side sheets G, and the crown sheet H, the crown sheet extending from the rear sheet to the flue sheet. The lower part of the extension or combustion chamber C of the fire box is completed by a curved sheet J which follows in a general way the curvature ,of the outer shell of theboiler. 'The -sheet 'd ilis spaced from the outel" sheet of the I provide a number of water circulating tubes L which rise from the floor portion of the extension C and lead upward and rearward to the upper part of the rear end of the fire box. These tubes not only add to the steaming qualities of the boiler by reason of the rapld circulation of the water in' the 1 boiler which is set u through them, but the tubes themselves ad materially to the radiating-surface of the fire box throughwhich' the heat of combustion is transmitted to the water. The tubes L are preferably curved orbent at their forward ends on relatively large radii as indicated at L", this construction serving to raise the tube proper to a suitable height above the grate so that the refractory arch M will be supported at a proper height above the grate to afford a suitable combustion space between the arch and grate. Asvindic'ated in Fig. 2 the forward end L of the tube is bent or formed in such 'a manner that it is caused to enter the sheet J substantially at right angles to the surface of the sheet at the point at which it enters. This is for the purpose of providing a construction wherein the tube can be 'mostflreadily, easily and properly secured, steam and pressure tight, in the sheet J.

In order to afford access to the end of the tube for the purposeof securing it in the sheet 'b expansion and beading, similar to the 'or inary manner in which a boiler flue is secured in a flue sheet, I provide an openin D in the sheet D located opposite to an directly in line with each of the ends L of the tubes L, and I preferably close these openings by means of screw plugs D. It will be understood that by removing the plugs D theproper tool can be inserted into the boiler throu h the opening D to expand the end of t e tube and properly secure it in the boiler sheet J.

To prevent the direct flow of the ases of combustion from the fuel bed to the ues and to cause their efiicient intermingling .and

- intermixing, I'interpose a refractory bafile in the path of the gases consisting of a transverse refractory wall N arranged at the rear end of the auxiliary combustion chamber C and the refractory arch M extending rearwardly from the upper end of the wall, and I support the wall M upon the tubes L. The wall N rises to a point slightly below the middle of the height of the auxiliary combustion chamber and ad'acent to the forward end of the grate, andprovide it with suitable openings to receive the tubes L which ass throughthe upper part of the wall, t e wall is thus braced or stayed in position by the tubes and the tubes are held against lateral displacement by the wall.

In the form of construction illustrated in the drawings, the upper ends of the curved parts L" of the tubes project through the upper part of the wall N, and, as the tubes at this point are inclined upwardly and rearwardly at quite a sharp angle, they serve to bracethe wall end against movement forwardly in the fire box.

As shown in the drawings, the wall is built up: of two transverse rows of bricks n and n, the lower row n being composed of several "individual bricks which are con-' formed on their lower edges to the curva-' ture of thefloor of the auxiliary combustion chamber C and are provided on their lower edges with projections n ada ted to 35 interlock with the floor of the com ustion chamber C to hold this lower row of bricks in place. The joint a.,.by which the lower sheet 0 of the combustion chamber C, and the sheet a forming the forward end of the fuel space, are jointed, provides the necessary projections to interlock with the bricks n In the form of my invention illustrated in; the drawings, the arch M is built up of a plurality of transverse rows of refractoryarch bricks m. These bricks extend between and are supported upon the tubes and are provided at their ends with sockets or grooves m adapted to receive the tubes. In a sense, the bricks are wedgingly interposed between the tubes and their wei ht tends to spread the tubes apart but the tu es are effectually prevented from reading by their interlockment with the wal N.

Between the outermost tubes and the adjacent side sheets, I sometimes place marginal bricks which I place in upwardl and outwardly inclined positions, wedging y engaging the side sheets and thus completing the arch, the Wall N effectually separates the lower part of the auxiliary combustion chamber C from the main conbustion chamber A, and the refractory arch M prevents the direct flow of gases of combustion to the upper part of the auxiliary combustion chamber. The complete baflle thus causes the gases of combustion from the forward end of the fuel bed to flow toward the rear end of the fire box and'in contact with the interior surface thereof before they can flow to the forward end and into the au xiliary combustion chamber C. This deflection of the gases causes an interminglin and a breaking up of the several strata an results in the practically perfect oxidation of all of the fuel before the gases of com bustion esca e throu h the tines. The inter locking of tile tubes with the wall N serves to hold the tubes against displacement or-180 bending, both vertically and transversely, which might be caused by the weight of the arch M. Furthermore the weight of the arch M serves to hold the Wall N in position, for the arch M being arranged in an upwardly inclined position upon the tubes L it presses against the upper part of the Wall and looks it gainst the curved portions L of the tubes L.

In Fig. 3 I have shown a slight modification of my invention which varies from the preferred form in that the tubes instead of being curved on long radii, as shown in Fig. 1, are deflected or formed on substantially straight lines connected by curved portions. The tubes rise as in the former instance at right angles to the floor of the auxiliary combustion chamber, and are thence bent rearwardly on an angle of about 4:3", as shown at (i), Fig. After they have risen to the desired height, as indicated at l, they are inclined rearwardly and upwardly to the rear sheet of the boiler in a position to properly support the arch M, and they also serve to hold the wall N in position. In this form the holes which are provided in the wall N to receive tubes can be made on straight lines instead of curved lines and are hence somewhat easier to produce.

As many modifications of my invention will readily suggest themselves to one skilled. in the art, I do not limit or confine my in vention to the particular structures and forms herein shown and described.

I claim:

1. In alocomotive boiler, a fire box having a barreblilre projection extending into the body of the boiler from the forward end of the lire box and serving as an auxiliary combustion chamber. in combination with water-0irculatiug tubes extending longirudb nally through the live box rising from the lower portion of the extension and extending thence warwardly and upwardly to the rear end, of the lire box, a refractory trans verse wall arranged at the rear end of the auxiliary condiustion chamber and a retractory arch composed of refractory bricks suprt-orted by and wcdgingly engaging the tubes and extending from the rear face oi the well, said wall serving to brace the tubes against the wcdging action of the arch bricks.

'2. In a locomotive oiler the combination with a fire box having an auxiliary coiubustion space extending forward into the barrel of the boiler beyond the front water leg and closed. at its forward end by the flue sheet, a refractory balllc wall closing the lower part of the mouth of said exten i n and water circulating tubes rising from the lloor of the extension between the n all and the flue sheet and extending roaruardly and upwardly through the fire box and through said refractory wall as and for the purpose specilied.

3. In a locomotive boiler having a fire box of the extension combustion chamber type closed at its forward end by the flue sheet, a refractory ballle Wall arranged in the mouth of said extension and partially closing the entrance thereto, and Water circulating tubes rising from the floor of the extension between the baffle wall and the flue sheet and extending rearwardly and upwardly through the fire box and through the upper part of said refractory Wall, as and for the purpose specified.

4. In a locomotive boiler the combination with a fire box of the extension combustion chamber type of longitudinally arranged water circulating tubes extending from the lower part of said extension and inclined upwardly and rearwardly through the fire box, a refractory bathe Wall resting upon the floor of said extension and arranged substantially above the front water leg of the fire box and engaging said tubes above their lower ends whereby the tubes and the Wall mutually support each other.

5. In a locomotive boiler having a fire box of the extension combustion chamber tvne closed at its forward end by the flue sheet,

a refractory battle supported in the mouth of said extension and partially closing the entrance thereto, water circulating tubes rising from the floor of the extension between the batlle Wall and the line sheet and extending rearwardly and upwardly through the fire box and through the upper part of said refractorv wall, and a rearwardly inclined refractory front arch supported by and upon the tubes, the forward end of the arch resting against the upper part of said. ballie wall whereby the arch is held in position.

(1. in a locomotive boiler in combination with a tire box of the extension combustion chamber type. of longitudinally arranged water circulating tubes extending from the lower part of said extension and inclined upwardly and rearwardly through the fire box, a vertical refractory wall resting upon the lioor of said extension arranged substantially above the front ator leg of the fire box and engaging said tubes above their lower ends, and an inclined arch supported by and upon said tubes extending from side sheet to side sheet and held in position by said wall.

In testimony whereof, I have hereunto set my hand, this 5th day of May, 1913, in the presence of two subscribing witnesses.

JOHN P. NEFF.

Witnesses:

EMILY Ii. MYERS, James. T. ANTHONY. 

